Sash-weight.



PATENTED MAY 22, 1906.

' F. O. SOHWBDTMAN.

SASH WEIGHT.

APPLIGATION FILED AUG. 16, 1905.

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FERDINAND O. SOHWEDTMAN, OF ST. LOUIS, MISSOURI.

SASH-WEIGHT.

Specification of Letters Patent.

Patented May 22, 1906.

Application filed August 16, 1905. Serial No. 274,464.

To all whom it may concern:

Be it known that I, FERDINAND O. SOHWEDT- MAN, a citizen of the United States, residing at the city of St. Louis, State of Missouri, have invented a certain new and useful Improvement in Cast Weights, of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawing, forming part of this specification, in which the figure represents a sectional view through a weight cast according to my improved method.

My invention relates to a new and useful improvement in cast weights, the object being to reduce the cost of such weights by the use of a permanent core, preferably of barytes, and whose specific gravity is as high as some grades of iron ore.

Heretofore it has been proposed to make a permanent core of pulverized iron ore, sand, &c.; but the objection to these materials is that the iron ore is but slightly frangible and the cost of reducing it to the desired degree is considerable, in addition to which it is quite expensive, the cheapest known to me at the present time costing over seven dollars per ton. Sand, while its first cost is cheap, is objectionable on account of its low specific gravity, the volume required for a certain weight being too great for practical purposes.

Barytes, the material which I propose to use, has a specific gravity equal to that of some grades of iron ore, is easily reduced, being highly frangible, and in addition its first cost is slightly over two dollars per ton.

In the manufacture of my improved cast weight I reduce the barytes to a finely-divided state and mix therewith a binder of rosin or any adhesive substance, after which the core is shaped and placed in an oven for the purpose of driving off moisture and occluded gases. On being removed from the oven the core is dipped in paraffin, shellac, or some other fluid, which when dry will render the core impervious to moisture and prevent its absorption of gases, presence of molten metal are likely to expand. It is preferable to dip the core in the paraffin or other material, as the case may which in the be, immediately after it is removed from the baking-oven and permit it to remain in the material, which in the case of paraffin or rosin would be heated so as to be in a fluid state, until the core has absorbed as much of such material as it can take up. In this way the pores of the core are filled and its tendency to absorb moisture or gases is reduced to a minimum. The core is-removed from the melted rosin or paraffin before the rosin or paraffin becomes sufficiently chilled to harden.

After the core is prepared as above described it is arranged in the matrix of the mold and the iron cast around it. The molten metal coming in contact with the coating on the core will melt it, leaving the pores open, into which pores the molten iron will flow so as to become firmly attached to the core where the weight is cylindrical. The shrinkage of the iron also tends to more firmly bind the core in place and prevent it from becoming loose.

In the accompanying drawing I have showna sash-weight made in accordance with my invention, in which A is the core, and B is the shell of metal cast around the core.

Having thus described my invention,what I claim, and desire to secure by Letters Patent, is-

1. As a new article of manufacture, a

weight composed of a core of ground barytes and a bonding agent surrounded by a shell of metal which fills the surface-pores of said core substantially as described.

2. As a new article of manufacture, a weight composed of a shaped core which consists of ground barytes mixed with a bonding agent, and having a fugitive coating of impervious material, and a shell of metal which fills the pores of the core formerly occupie by the impervious coating; substantially as described.

In testimony whereof I hereunto affix my signature, in the presence of two witnesses, this 12th day of August, 1905.

FERDINAND O. SCHWED'IMAN.

Witnesses:

F. R. CORNWALL, GEORGE BAKEWELL. 

